Printing-telegraph receiver.



G. S. HILTZ; PRINTING TELEGRAPH RECEIVER.

I APPLICATION FILED MAR. 21, 1912. 1,078,620, Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620. Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620. Patented Nov. 18, 1913.

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APPLICATION FILED MAR. 21, 1912. 1,078,620, Patented Nov. 18,1913.

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PRINTING TELEGRAPH RECEIVER.

APPLICATION IILED MAR. 21, 1912.

Patented Nov. 18, 1913.

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PRINTING TELEGRAPH RECEIVER. APPLICATION IILED nun. 21. 1912.

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jaw 4 hi0 G tto'cqu d UNITED STATES PATENT OFFICE.

GEORGE S. HILTZ, OF NEW YORK, N. Y., ASSIGNOR TO THE STOCK QUOTATIONTELEGRAPH COMPANY, OF NEW YORK, N. Y., A CORPORATION NEW YORK.

PRINTING-TELEGRAPH RECEIVER.

To all whom it may concern Be itknown that I. GEORGE S. HIUrz, a

citizen of the United States, residing at New York, county of Kings, andState of New York, have invented certain new and useful Improvements inPrinting-'lelegraph Receivers, of which the following is a full, clear,and exact description.

, This invention relates to receiving apparatus for printing telegraphsystems, more particularly apparatus of the general type described inthe prior patents of John Burry, No. 680,693, issued August 20, 1901,and No. 962,694, issued June 28, 1910.

In general, the chief object of the present invention is to provide whatis known as a one wire machine, that is, a machine which requires onlyone transmission circuit instead of two or more as is often the case,thereby materially reducing the cost of installation and operation ofthe system.

A further object is to simplify the apparatus generally, decreasing thecost of manufacture and diminishing the liability of derangement andlike difficulties in use.

To these and other ends the invention consists in the novel features ofconstruction and combinations of elements hereinafter described, andmore particularly set forth inthe appended claims.

A convenient and effective embodiment of the invention is illustrated inthe acconn panying drawings, in which Figure 1 is a front view of thecomplete machine. Fig. 2 is a plan view of the same. Fig. 3 is an endview of the machine, from the left of Fig. 1. Fig. 4 is a cross sectionon line aa of Fig. 1. Figs. 5 and 6 are also sections on line aa of Fig.1, but with certain parts added and others omitted. Fig. 5 alsoillustrates certain parts of Fig. 4 in a different operative position.Fig. 7 is a detail sectional view on line bb of Fig. 1, and Fig. 8 is asimilar but fragmentary view of certain of the parts in a difl en entposition. Fig. 9 is a diagrammatic view showing the wiring of themachine.

The operative parts of the machine are conveniently arranged onor-between three vertical plates or frames 10, 11, 12, which are mountedon a suitable base 13, preferably of insulating material.

The type by which the printing is done are arranged on the periphery ofa typewheel or type carrier 14 fast to a hub 15 Specification of LettersPatent.

Application filed March 21, 1912.

Patented Nov. 18,1913. Serial no. 685,145.

slidably mounted on a triangular or knifeedge shaft 16 journaled inforward extensions or brackets 17, 18, 19 on the frameplates 10, 11, 12at the upper part thereof. The shaft is rotated to bring any desiredcharacter to the, printing; point and the type wheel is moved along theshaft step by step to effect the letter spacing, as will be readilyunderstood. For the purpose of rotating the shaft it is provided betweenthe frame plates 10, 11, with a pinion 20, meshing with a gear 21loosely mounted on a shaft 22 (Figs. 1 and 2) journaled in the frameplates 10, 12. This gear on its inner face has a pin 23 engaged by theend of a coil. spring 241 encircling shaft 22 and engaging the samefrictionally at one end. Assum ing that the gear 21, pinion 20, andshaft 16 are prevented from rotating it will be seen that rotation ofthe shaft 22 in the proper direction will tension the encircling spring,causing the same to urge the gear in the direction of the arrow in Fig.3, but that over-winding of the spring is prevented by the slip affordedby the frictional engagement between the spring and the shaft.

The rotation of the shaft 16 and type wheel 14 is made step-by-step bymeans of a scape wheel 25 alongside of the pinion 20, having staggeredteeth on opposite sides of its periphery and cooperating with avibrating tongue 26. The latter is the armature of a polarizedelectromagnet 27, composed of two coils 28, 29, and a permanent magnet30, secured to the frame plates 10, 11. Ourrents of ditferent polarityflowing through the coils will therefore cause the tongue 26 to vibrate,thereby releasing the scape wheel and allowing the shaft 16 to rotatestep-bystep to bring the desired character to the printing point. Thus acurrent of a certain polarity will strengthen the magnetism of one poleof the magnet and neutralize the magnetism of the other pole, therebycausing the tongue to swing to the strengthened pole. Similarly, currentof opposite polarity will cause the tongue to swing to the other pole.In this way, by alternating the polarity of the current impulses sentthrough the magnet coils, the type wheel is caused to rotatestep-hy-stcp. Adjustable screw stops 31, 32 are provided on oppositesides of the tongue to limit its swing in each direction.

To permit justifying of the type wlieei,

that. is, accurately positioning of the characters at the impressionpoint before the printing is effected, the shaft 16 is divided in theusual manner (not shown), adjacent to the frame plate 11 On one part ofthe shaft is an ad'ustably mounted stop 33, engaged by a shoul er on thehub ofa star wheel,34 fixed on the other part, so that as the partcarrying the pinion 20 is rotated the stop 33, engaging said shoulder,will turn the other part in the same direction but Wlll permit more orless backward rotation thereof.'

Pivoted on the plate 11, adjacent to the star wheel, is a short finger35 (Figs. .2 and 4) having alaterally extending pin or stud 36, so thatas the upper and forward portion of the finger is depressed the studwill enter the opposed notch on the star wheel and, by the resultingcamming action of the same, give the type wheel shaft 16 aslightmovement of rotation sufficient to bring accurately to t he impressionpoint the character which had been brought a proximately thereto throughthe medium 0 the sca pe wheel 25 being understood that the charactersoirtlie type Wheel and the notches on the star wheet are in accurateregister of alinemcnt Wlill'l. is normally held each other. The finger35 up, with the stud 36 disen aged from the star wheel, by a light coilsiiring 37, but is depressed in advance of each pa nting operation by anarm 38 extending forwardly from the armature shaft 3"), of a magnet 40,into engagement with a pin 41 on thelowcr portion of the finger. The armjust mentioned is preferably made suf iciently yielding or springytoavoid excessive pressure of the stud 36 on the justifying star-wheel34.

To minimize the binding effect of the driving spring 24 (Figs. 1 and 2)urging the scape l-wheel teeth against .the armature tongue 26, thepinion 20 by which the'force of the spring is transmitted to the scapewheel shaft 16, is loosely mounted on the shaft but is connectedyieldingly thereto by a coil spring 42 which encircles the shaft andengages the same and the pinion frictionally.

The spring 24, which, as previously ex-- plaincd, rotates the typewheel, is wound up by a suitable ratchet and pawl mechanism shownin'Fig. 3. The ratchet 4'3 is rigidly mounted on the shaft 22, andcotiperating therewith is a pawl 44 pivoted on the lower portion of anarm 45 adj11stably.fastened on the armature shaft 39 of the magnet 40,so that as the shaft is rocked by energization of the magnet the pawlwill be raised and so impart a slight movement of rotation to theratchet and the shaft. 22. This actuation of the shaft 22 is aided byanother paw], 46, the purpose of which will be more fully explainedhereinafter. During the retraction of these pawls the ratchet is' heldagainst backward rotation by a holding pawl 47. Between the frame plates10, 11, the shaft 22 is provided with a heavy fly wheel or momentumdevice 48 (Figs. 1, 2 and 3), which, started by the vigorous impulse ofthe pawls 44, 46, carries the shaft around farther than the movement ofthe pawls alone would carry it, thereby increasing the winding effectand' insuring sufficient tension at all times to cause instant responseof the scape wheel to the vibration of the armature tongue 26. Aspreviously explained, over- 'winding of the spring is obviated by thefrictional engagement between the spring and its shaft 22.

The magnet 40, through the instrumentality of its armature 49 and shaft39, also shifts the type wheel along the shaft 16 to efiect the letter.spacing, as will now be explained.

Below and to the rear of the type'whecl shaft 16 is a triangular orknife-edge shaft 50 (Figs. 1 and 4) journaled in the frame plates 11, 12in such a manner as to permit a slight movement of rotation and carryinga sliding sleeve 51 provided with arms '52 extending upwardly intoengagement with an enlargement 53 of the type wheel hub 15 on oppositesides thereof, so thatthe type wheel can rotate with its shaft but willmove axially on its shaft as the sleeve 51 is shifted. This sleeve isconnected to two cords 54, 55, extendinglin opposite directions overpulleys 56, 57 to winding drums. 58, 59, so that the sleeve, and with itthe type wheel, will be drawn to right or left according to thedirection of rotation of the drums. The drum 59 is fixed on a shaft 60,on which a ratchet 61 is fixed at the left of the drum 58. This ratchetis actuated, clockwise as viewed in Figs. 4 and 5, by a hook pawl 62pivoted at its rear end to an arm 63 depending from armature shaft 39and adjustably fastened thereto. When the armature 49 is depressed theconsequent swing of the arm 63 advances the pawl 62 past one tooth onthe ratchet; when the armature is raised bythe powerful coil spring 64(Fig. 3) cooperating with the arm 45 the rearward swing of the arm 63retracts the pawl and turns the ratchet 61, shaft and winding drum 59through an angle equal to the angular width of one tooth, thus shiftingthe type wheel a distance equal to one letter space along the shaft 16.Backward movement of the ratchet 61 is prevented during the advance ofpawl 62 by a holding pawl 62, held normally in engagement with theratchet by a light spring 62". The rightward travel of the type wheel isavailed of to provide power for the retraction of the type wheel toinitial position, through the instrumentality of two coil springs 65 and66, encircling shafts 60 and 67. The first of these springs has one endengaging a pin 68 on a collar 69 fast on the sleeve 69, which is looseon the shaft 60 and connected to the hub of the winding drum 58. Theother end of the spring 65 bears against a pin on a. pinion 71 looselymounted on the shaft 60 and meshing with a gear 72. The gear just namedis loose on the fixed shaft 67 and has a pin 73 engaged by the adjacentend of the spring 66, the other end of which is fastened to the shaft.Now as the shaft '66 is rotated to advance the type wheel, the unwindingof the cord 54 rotates the winding drum 58 which communicates its motionto't he spring 65, pinion 70, gear 72, and spring 66, thereby tensioningthe two springs, which, as will be seen in Fig. 1, are coiled inopposite directions. It will therefore be seen that if at any time thepawls 62 and 62 are simultaneously dis-.

engaged from the ratchet 61 the springs 66,

65 will instantly revolve the drum 58,; which, by winding up the cord54, retracts; the sleeve 51 and with it the type wheel. Manifestly, thisreturn of the type wheel to initial position should take place from anydesired point in the type wheels path at the will of the sendingoperator. For this purpose the following mechanism is provided: The pawl62 is provided on its under side with an inclined cam-edge 74 (Figs. 4and 5) adapted to engage, as the pawl is advanced bymagnet 40, a pin orstud 75 on the lower endiof an arm 76 piv oted at its upper end 50 thebracket 18. Between the cam edge 74 and the point of attachment to thearm 63 the pawl is pivotally connected to a depending link 77 which ispivotally connected at its .lower end to a lever 78 at the point 79,which lever is fulcrumed on the frame plate 11 at 80, in rear of thepoint 79. At its forward end this lever is provided with a stud 81,lying under the tail of the holding pawl 62*, which, it will beremembered, normally holds the ratchet 61, shaft 60, and winding drum 59stationary during the advance of the actuating or letter-spacing pawl62. Ordinarily, the cam-edge 74, as the pawl 62 is advanced, simplyswings the arm 76 idly forward; but when the sending operator desires toreturn the type wheel to initial position he rotates the type. wheel (bysending impulses of alternating polarity through magnetic coils 28, 29,as previously explained) until a certain blank space on the type wheelis at the printing point. 011 the type wheel shaft 16 is a finger 82,which, when the said blank space is at the printing point, standsopposite and almost in contact with a lug 83 on the swinging arm 76.\Vhen the arm 76 starts to swing as the cam-edge 74 advances it findsthe finger 82 in its path and is arrested thereby. The cam-edge thenrides up on the stud 75, lifting the pawl 62 out of engagement with theratchet and also raising link 77. The latter raises the forward end oflever 78, which in turn raises the rear end of the holding pawl 62,thereby disengaging the pawl from the ratchet, as shown in Fig. 5. Theratchet and the winding drum 58 can now revolve under the influence ofsprings 65, 66 and retract the type wheel as previously explained. Whenthe type wheel is next rotated to bring a character to the printingpoint the finger 82 is carried away from in front of the lug 83, so thatthe type wheel can again move forward.

The type wheel should of course be returned to initial position when itreaches the end of its rightward travel, but as the distant sender mayforget. this important movement, provision is made as follows for theautomatic return of the wheel whenever it reaches its extreme rightwardposition.

It is plain that whenever the stud 75, on the arm 76, is held stationaryin the path of the advancing cam-edge 74 the pawls 62 and 62 will bedisengaged from the letterspacing ratchet. For the purpose of thusholding the stud whenever the end of a line is reached an arm 84 (Fig.4) is provided, having its upper end in front of one end of stud 75 andits lower end adjustably fixed on a shaft 85 journaled in the frameplates 11, 12, at the bottom thereof. At its right end this shaft has anupstanding arm 86 behind the shaft 67, provided with a forward] yextending finger 87. Manifestly, the forward movement of the stud 75asthe pawl 62 advances causes the shaft 85 to rock and the arm 86 to swingforwardly; hence if the arm is held stationary the stud 75 cannotadvance, and the cam-edge 74 will ride up on the stud, therebydisengaging pawls 62 and 62 from the ratchet 61 as previously described.Fixed to shaft 60, near the winding drum 59, is a pinion 88 meshing witha gear 8.) loosely mounted on shaft 67. Loosely mounted on the sameshaft is an arc-shaped member 90 having a laterally extending pin 91 andalso provided with a notch 92 which is in the circular path of a stud 93on the gear 89. As the type wheel moves to the right the stud 93 engagesthe notch 92 and rotates the arcshapcd member on the shaft 67, carryingthe pin 91 toward the stud 87 on. arm 86. At the instant the type wheelreaches its extreme rightward position the pin lies directly in front ofthe stud, as shown in Fig. 8; consequently the arm 86 cannot swingforwardly when the pin 75 on arm 76 is engaged by the camedgt' 74 on thepawl 62. The pin or stud 75 being thus held stationary the cam-edge 74rides up on the stud and causes disengagement of the pawls 62, 62" fromthe ratchet 61, thereby permitting the springs 65, 66 to revolve thewinding drum 58 and retract the type wheel, as previously described.

The paper on which the printing is done is preferably'in the form of acontinuous strip, wound into a roll 94 (Fig. 2) carried on a spindle 95removably mounted in suitable bearings at the back of the machine. Fromthe roll the paper passes upwardly with its edges in slottedguidemembers 96 (Figs. 5 6 and 1). and passes between the type wheel and theprinting bar or platen 97. Between the slotted guides the paper isengaged by two friction disks or wheels 98 on'a shaft 99 and two crampdisks 100 on a shaft 101. The latter shaft is journaled in pivotedcarriers or arms 102 held in the position shown in Fig. 6, with thecramp disks cotiperating with the friction feed disks 98, by two bladesprings 103. When the paper is to be inserted or removed the cramp diskshaft 101, with the cramp disks, can be swung up and out of the way,against the tension of the clamping springs 103. For the purpose ofrotating the shaft 99, and with it the feed disks 98, so as to feed thepaper step-by-step past the printing bar or platen, the shaft mentionedis provided with a ratchet 104 (Figs. 1 and 6) adjacent to the frameplate 11. This ratchet is engaged by a hooked feed-pawl 105 pivoted onthe upper end of a vertical arm 106 rising from the armature shaft 107of an electromagnet 108. The feed pawl being held in yielding engagement with its ratchet by alight spring 109, it is evident that when thearmature 110 is depressed by the magnet the resulting rearward movementof the pawl (Fig. 6) will rotate the ratchet through a correspondingangle, thereby feeding the paper past the printing point. Preferably theparts are so proportioned that the ratchet will be turned through anangle equal to one tooth at each depression of the armature, andthe feeddisks 98 are of such diameter that the movement of rotation thus giventhem will give to the paper a movement of one line-space. To preventbackward movement of the pa per while the coil spring 111 is raising thearmature 110 and advancing the feed pawl to the next tooth, a holding,pawl 112, is provided, held in engagement with the ratchet by a lightspring 118. To prevent excessive movement of the paper in the forwarddirection when the feed pawl is in its rearward position as might becaused by the weight of a long strip of the paper depend ing from themachine. a second ratchet, 11 1, is provided alongside the first on theshaft 99, with a normally disengaged holding pawl 115. A light spring116 tends to raise this pawl, but the latter is held down by a longfinger 117 adjustably fixed on the arm- 106 and normally resting on apin 118- on the pawl. As the feed pawl 105 is retracted the finger iswithdrawn rearwardly off the pin, allowing the hooked holding pawl 115to spring up into engagement with the ratchet 114 (Fig. 6). Advance ofthe feed pawl,to the next tooth on ratchet 104 brings -the finger againinto engagement with the pin 118 and thus depresses the holding pawl115. While the line-spacing mechanism is inactive the weight of thedepending strip of paper, however long, is insufiiclent to overcome theinertia of the parts, but the paper may be grasped by the hand and drawnofl the roll in any amount since as will be seen, none of the pawlsprevents forward rotation of shaft 99 when the paperfeeding mechanism isnot in operation. The upward movement of armature 110 and the forwardswing of arm 106 are limited by a stop 110. f

It is obvious that the paper should be advanced one step at each returnof the type Wheel toits leftward or initial position. This is effectedautomatically, as follows Themagnet 108 is in series with a pair ofnormal y closed contacts 119, 120 (Figs. 4 and 9), (which contactsarealso in series with magnet 40), so that normally the magnet 108 is shortcircuited and therefore deenergized. When, however, the lever 78 isactuated (as previously explained) to disengage the holding pawl 62 fromratchet 61, a depending finger 121 on the rear arm of said lever engagesthe spring contact 119 and separates it from contact 120 (Fig. 5). Thisbreaks theshort circuit and permits current to flow through magnet 108,thereby energizing the same and causing depression of the armature 110with consequent actuation of the paperfeed pawl 105. The return of lever78 to its normal position when the letter-spacing pawl 62 is retractedraises the finger 121 and permits the contacts 119, 120 to close again,thereby deenergizing magnet 108.

If additional line-spacing is desired, the sending operator brings, thefinger 82 opposite lug 83 in the arm 76 (Pig; 4), whereupon repeatedactuation of the armature 49 will cause a corresponding number ofenergizations of magnet 108; it being remembered that an attempt toprint with the finger- 82 and stud 83 in alinement causes disengagementof holding pawl 62 from ratchet 61, which disengagement is alwaysaccompanied by onergization of magnet 108 and consequent feed of thepaper as just described.

After the type wheel has been justified, as previously explained, theplaten 97 must he moved forward to carry the paper against thetype'wheel and effect the printing. For this purpose the platen ismounted in the upper part of a swinging frame 122 (Figs. 4. and 5)having at one end a depending finger 123 in the path of a finger 124pivoted on the upper end of an arm 125 rising from a short shaft 126journaled in the frame plates 10, 11, on which shaft the said arm isadjustably fixed. The finger 124 is held yieldingly against a stop 127on the arm 125 by a light blade spring 128, so that as the arm is swungforward the finger 124 will be swung under the finger 123 when the twocome into engagement. )Vhen, however, the arm 125 slvings rearwardly thefinger 124,,held by the stop 127,

carries finger 123 in the same direction, thereby swinging the platen 97against the paper and carrying the latter smartly against the typewheel, as will be readily understood. The shaft 126 is rocked, toactuate the arm 125, by an arm 129 adjustabiy mounted on the shaftoutside of the frame plate 10 (Figs. 5 and 3) and connected by a link130 to an arm 131 adjustably mounted on the armature shaft 132 of anelectromagnet 133. On the last named shaft an adjustably mounted arm134, pivotaily connected by means of a slot .135 and pin 136, to the arm45, which, it will be remembered, is actuated by magnet 40 through themedium of armature 49 and shaft 39. It will therefore be seen thatrocking of the armature shaft 39 rocks the shaft 126 and actuates thearm 125. It will also be seen that by reason of the greater combinedlength of arms 38. and 35 (Fig. l) by which the justifying pin 36 isactuated the type wheel will be justified bethe platen frame 122 andplaten 97 are actuated bythe arms 45, 134, etc., as, obvious y, shouldbe the case. The shaft 132 is also provided with an adjustably mount-.ed arm 137 (Fig. 3) to which the pawl 46,

previously mentioned, is pivoted, and by which the pawl is actuated.

For the purpose of making the operation of the machine as rapid aspossible the mag nets 27 and 40 are energized simultaneously, the latterhaving a small time-constant and being capable bf energization bycurrent of either polarity. It is evident, however, that the magnet 40should not actuate its armature. 49,-to justify the type wheel andactuate the platenuntil magnet 27 has brought the proper character onthe type wheel to the printing point. This necessary operation of magnet27 before magnet 40 is provided for by making the spring 64, by whichthe parts connected to the armature 50 are restored to initial positionand against which such parts must be moved by the said armature, toopowerful to be over come by the magnet 40 unaided. Consequently, nomatter how long current is allowed to flow through magnet 40 the lattercannot, by itself, actuate the armature and the train of mechanismconnected therewith.

For the purpose of f-urnisl'iing the additional power required todepress the armature 49 the power-magnet 133 (Fig. 3) is prm idedbetween the frame plates l0. 11, in position to actuate an armature 138adjustably fixed to and depending from the armarapidity.

ture shaft 132,which shaft, it will be remembered, is connected by arms131 and 134 to the mechanism associated with armature shaft 39. Themagnet 133 is not polarized, and can therefore be energized by currentin either direction, but its time constant is relatively large, so thatthe comparatively rapid alternation of the impulses sent to actuate thearmature tongue 26 will not energize the magnet sufliciently to actuatethe armature 138; that is, before the field produced by current in onedirection can build up to suflicient strength for the actuation of thearmature the polarity of the magnet is reversed by an impulse ofopposite sign, and so on, as long as the alternating impulses followeach other with sufficient When, however, the type wheel has been set bythe alternating impulses from the transmitter the final impulse, ofwhichever polarity it happens to be, is simply prolonged moi'ncntarlly,thereby causing encrgization of the power-magnet 133. The armature 138is now powerfully attracted at the same time that armature 50 isattracted by the already energized magnet 40, with the result that thetwo armatures are promptly actuated. Vhen the circuit is broken themagnets are deenergized, the armature tongue 26 remains againstwhichever stop 31, 32 it happened to be hearing on when the finalimpulse was prolonged,

and the spring 64. aided by the spring 139 (Fig. 3) restores to normalposition the armatures 50 and 138.

For the purpose of inking the type wheel an inking roller 140 (Figs. 1and 6) is provided having a facing of spongv rubber or equivalentmaterial in contact with the type. This roller is removably journaled ina pair of arms 141 depending from the sleeve 51. By means of a spring142 the knife-edge shaft 50, on which the sleeve slides, is urgedcounterclockwise (as viewed in Fig. 6) thereby holding the inking rollerlightly against the type wheel. Mounted on the frame plate 12 is atubular ink reservoir 143 provided with a brush-like wick 144 in thepath of the inking roller, so that as the roller passes the. wick itwill be smeared with ink which is drawn up from the reservoir bycapillary attraction.

The unison device provided is of, simple construction and is illustratedin Figs. 1 and 2. Around the shaft 16, between the scape wheel 25 andthe stop 33, a short piece of wire 145 is wound helically, with itsturns spaced as shown to constitute screw threads. These threads engagethe lower edge of a horizontally and vertically movable arm 146 whichextends over a pin 147 projecting downwardly and laterally from an arm148 on the armature shaft 39. As the shaft 16 rotates to set the typewheel the thread 145 carries the arm 146 toward the left' (as viewed inFig. 2), but each time the armature 49 is depressed the arm 148 and pin147 are raised, lifting the arm 146 out oil engagement with the helix orthread and allowing the spring 149 to swin the arm rightwardly toinitial position. I ,however, the type wheel should, without printing,be revolved several times, say twice for example, the leftwardlyextending-pin 150 om arm 146 is carried into the path of the finger 151on the shaft 16; said finger being in the, present instance merely theprojecting end of wire 145. The type wheel shaft now cannot rotateuntil. printing is effected, which latter operation of course leaves thereceiver in unison with the distant transmitter.

It is desirable, though not essential, that the machine should notoperate to space the type wheel along the shaft 16 when the paper is notin position to receive impressions, as such operation would merelyresult in smearin the platen with ink. To prevent this resut an arm 152(Figs. 2 and 6) is provided, mounted loosely on the sleeve 51 andprojecting upwardly therefrom. This arm rests by gravity on the paper.When, gwithout the paper being in place, the type wheel is returned toits leftward or initial position the arm drops rearwardly past'the leftend of the platen '97, and hence prevents rightward movement of the typewheel, even though current for such movement be sent through themachine. If, however, the

aper' is in place, the edge thereot'toveriiangs the end of the platenand so prevents the arm drop ing past the same, leaving the type wheelfree to travel. below the platen the arm 152 is provided with two lugs153, 154, which serve to bend the paper more sharply over the platen andto prevent thefpaper bulging out into contact with the type wheel. Theforward swing of the arm 152, as the platen carries. the aper againstthe type wheel, is limited by tlie's'haft 16 in the path of a finger152' on the said arm, so that by no 'ossibility can the lugs 153, 154move toward the type wheel far enough to let the paper come into contacttherewith above and below the platen. v

The four magnets and the circuit therefor are shown diagrammaticallyinFi 9. Any convenient and suitable transmitter can be employed which iscapable of sending im ulses of either polarity at will, and a simp eaparatus for the purpose is illustrated in otted lines in Fig. 9. Thetransmission circuit, re resented by the wires 155, 156, is connecte totwo keys '157, 158, marked and respectively, playin between twoconducting bars 159, 160, wit the upper of which both keys are normallyin contact. Depression of key 157, out of contact with the upper bar andinto contact Above andwith the lower, will therefore send a currentimpulse from the battery 161 to wire .155.

Similar] depression of key 158 will send an impu se to wire 156.

he operation of the various parts of the machine having already beenexplained in detail further description is deemed un; necessary Themachine herein specifically illustrated and 'described has provedsatisfactory in practice and is the form preferred, but

vthe invention is capable of embodiment in" other apparatus withoutdeparture from its proper spirit and scope as defined by the followingclaims.

I claim 1. In a printing telegraph receiver, in combination, type wheelsetting means includin an actuating electromagnet; a ci'r-. cuit terefor; mechanism for taking impressions from the type wheel includingan 1 overloaded elect'romagnet in said circuit; and a powerelectromagnetin the same'ci cuit and operatively connected with the saidmechanism.

2. In a printing telegraph receiver, in combination, type wheel-settingmeans, including an electromagnet; mechanism for takingimpressions fromthe t pe wheel and mechanism for effecting the letter spacing, includingan overloaded electromagnet in circuit with the first named ma st; and apower electromagnet in circuit with the first named and operativelyconnected with the said mechanisms.

3. In a printing telegraph receiver, in combination, type wheel settingmeans, including an electromagnet energi able by current of eitherpolarity; rinting'mechanism, including an overloa ed electromagnetenergizable by current of either 0- larity; a power electromagnet havinga re iatively large time-constant and energizable by current of eitherpolarity; and asingle energizing circuit for all said electromagnets.

4. In a printing telegraph receiver, in combination, a type whee meansfor rotating the type whee step by step, including an electromagneticescapement operating on current of alternating polarity; printingmechanism, including an overloaded electromagnet energizable by currentof either polarity; a power electromagnet of relatively lar timeconstant and energizable by current of either polarity and a singleenergizing circuit for all the electromagnetic instrumen-- talities 5.In a printing telegraph receiver, in combination, a ty 0 wheel; meansfor settin the same to ring a desired character to t e impression point;mechanism for shifting the ty e wheel from an initial osition to effectt 0 letter spacing; mechanism for returning the type wheel to itsinitial position; an overloaded elcctromagnet associated with saidmechanisms to actuate the same; a power electromagnet of relativelylarge timeconstant in circuit with the first named magnet; paperfeedmechanism to effect the line spacing; an actuating electromagnettherefor, and normally out of cir cuit with the first two namedelectromagnets; and means for cutting the last named magnet into circuitwith the first two when the type wheel returning mechanism actuated.

6. In a printing telegraph receiver, in combination, a type wheelmovable step by step from an initial position to effect the letterspacing and mechanism for returning the type wheel to initial position,including an electromagnet; paper feedin mechanism to efi'ect the linespacing, inclu ing an electromagnet normally out of circuit with thefirst named magnet; and automatic means to cut the paper feeding magnetinto circuit with the type wheel returning magnet when the type wheel isreturned to initial position.

7. In a printing telegraph receiver, in combination, a type wheelmovable step by step from an initial position to effect the letterspacing and means for returning the type wheel to initial position,including an electromagnet; an energizing circuit for Said magnet; paperfeeding mechanism to effect the line spacing, including a normallyshort-circuited electromagnet to actuate the same; and means to breakthe short circuit and thereby include the last named magnet. in thecircuit, when the t pe wheel returning mechanism is actuatedi 8. In aprinting telegraph receiver, in combination, a type wheel movable stepby step from an initial position toefl'ect the letter spacing; mechanismfor returning the type wheel to initial position, including anelectromagnet; an energizing circuit therefor, having a air of normallyclosed contaets; paper .eeding mechanism to effect the line spacing,including an electromagnet having its terminals connected to saidcontacts; and means, actuated by the type wheel returning mechanism, toseparate said contacts and thereby include in said circuit the paperfeeding magnet.

, 9. In a printing telegraph receiver, in combination, atype wheelmovable step by step f'roman initial position to effect the letterspacing and mechanism for returning the type wheel to initial position,including an electromagnet; an energizing circuit therefor; automaticmeans acting when the type wheel reaches the limit of its travel. to setin operation the type wheel returning mechanism; paper feedingmechanism, including an actuating electromagnet, to effect thelinefspacing; and mechanism, actuated by the said automatic means, tocut into the energizing circuit the said actuating electromagnet,whereby the paper feeding mechanism will be actuated.

10. In a printing telegraph receiver, in combination, a type wheelrotatable to bring a desired character to the impression point; anelectromagnetic escapeme'nt actuated by current of alternating polarityto control the rotation of the type wheel; mechanism for justifying thetype wheel at the impression point; mechanism for taking impressionsfrom the type wheel; mechanism for shifting the type wheel axially toefl'ect the letter spacing; an electromagnet in circuit with theelectromagnetic esca ement and me chanically connected with tiie saidmechanisms and energizable by current of eithei polarity but of its ownpower incapable of spring; mechanism for justifying the type wheel atthe impression point; mechanism for taking impressions from the typewheel; mechanism for shifting the type wheel axi ally to effect theletter spacing; an electromagnet mechanically connected with saidmechanisms, the magnet being in circuit with the electromagneticescapement and energizable by current of either polarity but of its ownpower incapable of actuating said mechanisms; and a power electromagnctin circuit with the first named, mechanically connected therewith andenergizable by a prolonged current impulse of either polarity.

12. In a printing telegraph, in combination, a type wheel shiftableaxially to effect the letter spacing; mechanism for shifting the typewheel; mechanism for taking impressions from the type wheel; anelectromagnet having an armature connected with said mechanisms, saidelectromagnet being of its own power incapable of actuating its armatureto operate the mechanisms mentioned; a power electromagnct of largertime constant in circuit with the first, and having an armature; andmechanism linking the armatures together to compel them to operatesimultaneously. I

13. In a printing telegraph receiver, in combination, a rotatable typewheel shiftable axially to efi'ect.the letter spacing;

mechanism; including a ratchet and an actu;

from the ratchet; a movable member in the the type whee path of theactuating pawl; and means rotated by said reversing means to hold themovable member stationary so as to disengage the pawls from the ratchetwhen the printing wheel has been shifted to the limit of its lateralmovement.

14. In a printing telegraph receiver, in combination, a typewheel shaft;a type wheel -slidably mounted on the shaft and.

rotatable therewith; an electromagnetic escapement controlling therotation of the shaft; electromagnetic mechanism for advancing the typewheel on its shaft from an initial position to effect the letterspacing, saidmechanism includin a ratchet, an actuating pawl, and, aholding pawl for the ratchet; a, spring tensioned by the advance of thetype wheel and serving to return the type wheel to initial osition whenthe said pawls are disengaged from the ratchet; a movable memberarranged in the path of the said ratchet-actuating pawl and serving tocause disengagement of said pawl from the ratchet when said member isheld stationary; means positioned in the path of said member by suitablerotation of the type wheel shaft, to hold the member stationary;

'and means operated by disengagement of the actuating pawl from theratchet to release the holding pawl from the ratchet.

15. In a printing telegraph receiver, in combination, a type wheelshiftable axially from an initial position. to effect the letterspacing; mechanism for shifting the type wheel, including a ratchet, anactuating pawl and a holding pawl therefor; a spring serving to returnthe type wheel to initial position when the said pawls are disengagedfrom the ratchet; an electromagnet associated with the actuating pawl toactuate the same and advance the type wheel; mechanism for advancing thepaper to effect the line spacing; an actuating electromagnet, associatedwith the last named mechanism and normally out of circuit with the othermagnet; and means operable at will to simultaneously cause release ofthe said pawls from the ratchet and out said actuating magnet intocircuit with the first.

16. In a printing telegraph receiver, in combination, a type wheel,mechanism for advancing the type wheel from an initial position toeffect the letter spacing, including a ratchet, an actuating and aholding pawl therefor a spring serving to return it to nitial positionwhen the pawls are disengaged from the ratchetpan electromagnetassociated with the actuating ratchet.

pawl to actuate the same; mechanism for advancing the paper to effectthe line spacing; an electromagnet associated with the paper advancingmechanism to actuate the same; a pair of normally closed contacts incircuit with the first named magnet and connected with the terminals ofthe last named magnet; a lever connected at one end to said holding pawlto release the same from the ratchet and having its other end adapted toseparate said contacts whereby to cut the second named electromagnetinto circuit with the first; means serving to cause disengagement of theactuating pawl from the ratchet; and means connecting the actuating pawland said lever, to actuate the latter when the said pawl is disengagedfrom the 17. In a printing telegraph receiver, in combination, aletter-spacing ratchet; a reciprocatory actuating pawl therefor, havinga cam edge; a stop in the path of the cam elge and normally movable idlytherewith; devices for holding the stop stationary whereby the cam edgecooperating with the I stop will disengage the pawl from the ratchet,said devices being normally movable with the stop; a spring tending toreversely rotate the ratchet; a holding pawl associated with the ratchetto prevent such reverse rotation when the actuating'pawl is advanced;alever associated with the hold ing pawl to disengage the same from theratchet; a link connecting the actuatingpawl and the lever whereby toactuate the latter and cause release of the holding pawl when theactuating pawl is disengaged from the ratchet; and means operable forpre'- venting movement of the said stop-holding devices. 18. In aprinting telegraph receiver, in combination, a letter-spacing ratchet; apivoted reciprocatory pawl to rotate the ratchet in one direction, andhaving a camedge; a spring tending to rotate the ratchet in the reversedirection; a pawl to hold the ratchet from reverse rotation; a pivotedarm having a stop pin in the path of the said cam edge; a leverassociated with the holding pawl to disengage thesame from the ratchet;a link pivotally connected to the lever and the actuating pawl, wherebythe link swings idly as the pawl reciprocates but actuates the lever torelease the holding pawl from the ratchet when the actuating pawl isswung out of engagement with the ratchet; and means for preventingpivotal movement of said arm, whereby to hold the stop pin' stationaryin the path of the cam-ed e, causing the actuating pawl to ride up on tto pin and to be disengaged from the ratchet. 19. In aprintingitclegraph receiver, in combination, a rotatable type wheel,shiftable axially to effect the letter spacing; mechanism, including aratchet and an acfor revcrscly rotating the ratchet to retract the disk,and a stop carried by the disk adapted to be interposed in the path ofthe 15 movable member so as to cause the pawls to be disengaged from theratchet when the type wheel has been shifted to the limit of its lateralmovement.

In testimony whereof I afiix my signature 20 a holding pawl cooperatingwith the ratchet; an electromagnet associated with the actuating pawl tooperate the same; a I circuit for said electromagnet; means ten-- sionedduring the shifting of the type wheel I tuating pawl, for shifting thetype wheel; I

the type Wheel when said pawis are disenin the presence of twosubscribing witnesses. gaged from the ratchet; a movable nminncr GEORGEs HILTZ in the path of the actuating pawl; 21 wheel I rotated by thereversin means; a loosely Witnesses:

mounted disk adjacent i120 wheel, the latter M. LAWSON DYER,

after a partial rotation thereof engaging! S. S. DUNHAM.

